Display device

Abstract

A display device includes a substrate; a plurality of pixels provided on the substrate; and a plurality of inorganic light emitting elements provided on each of the pixels. The inorganic light emitting elements each include a semiconductor substrate having a first face facing the substrate and a second face provided in a convex shape on a side opposite from the first face; and a plurality of semiconductor nanowires provided on the first face, the semiconductor nanowires extending in a direction perpendicular to the first face.

What is claimed is: 
     
       1. A display device comprising:
 a substrate; 
 a plurality of pixels provided on the substrate; 
 a plurality of inorganic light emitting elements provided on each of the pixels; and 
 a reflective plate provided on the substrate, wherein 
 the inorganic light emitting elements each includes:
 a semiconductor substrate having a first face facing the substrate and a second face provided in a convex shape on a side opposite from the first face; 
 a plurality of semiconductor nanowires provided on the first face, the semiconductor nanowires extending in a direction perpendicular to the first face; 
 protective layers covering the respective semiconductor nanowires; and 
 a contact layer covering the semiconductor nanowires and the protective layers provided on the first face, 
 
 the contact layer is coupled onto the reflective plate, 
 the protective layers include a transition metal oxide, 
 lower ends of the protective layers are electrically coupled to the reflective plate, and 
 in the contact layer, the protective layers entirely cover vertical sides and lower portions of the respective semiconductor nanowires, the lower portions facing the reflective plate. 
 
     
     
       2. The display device according to  claim 1 , wherein
 the protective layers have a refractive index smaller than a refractive index of the semiconductor nanowires, and 
 the contact layer has a refractive index smaller than the refractive index of the protective layers. 
 
     
     
       3. The display device according to  claim 1 , further comprising:
 an element insulating film provided between the inorganic light emitting elements; and 
 a translucent conductive film covering the inorganic light emitting elements and the element insulating film, the translucent conductive film being electrically coupled to the semiconductor substrate. 
 
     
     
       4. The display device according to  claim 3 , wherein an upper face of the element insulating film has a concave shape recessed toward the substrate between the inorganic light emitting elements. 
     
     
       5. The display device according to  claim 1 , wherein the semiconductor nanowires each have a hexagonal shape in a plan view in the direction perpendicular to the first face and are placed in a triangular grid on the first face. 
     
     
       6. The display device according to  claim 1 , wherein the semiconductor nanowires each have a hexagonal shape in a plan view in the direction perpendicular to the first face and are placed in a matrix on the first face. 
     
     
       7. The display device according to  claim 1 , wherein the semiconductor nanowires include a first group of semiconductor nanowires including the semiconductor nanowires provided at a central part of the first face and a second group of semiconductor nanowires including the semiconductor nanowires placed at an outer edge of the semiconductor substrate. 
     
     
       8. The display device according to  claim 1 , wherein the second face has a curved face curved in a convex shape. 
     
     
       9. The display device according to  claim 1 , wherein the semiconductor substrate has a trapezoidal shape in cross-section. 
     
     
       10. The display device according to  claim 1 , further comprising a barrier provided between the inorganic light emitting elements. 
     
     
       11. The display device according to  claim 1 , wherein the semiconductor nanowires each include
 an n-type semiconductor extending in the direction perpendicular to the first face; 
 a p-type semiconductor provided at least on a side face of the n-type semiconductor; and 
 an active layer provided between the n-type semiconductor and the p-type semiconductor. 
 
     
     
       12. A display device comprising:
 a substrate; 
 a plurality of pixels provided on the substrate; 
 a plurality of inorganic light emitting elements provided on each of the pixels; 
 lens members provided on the respective inorganic light emitting elements; and 
 a reflective plate provided on the substrate, wherein 
 the inorganic light emitting elements each includes:
 a semiconductor substrate having a first face facing the substrate and a second face that is a face on a side opposite from the first face and provided in a concave shape toward the first face; 
 a plurality of semiconductor nanowires provided on the first face, the semiconductor nanowires extending in the direction perpendicular to the first face; 
 protective layers covering the respective semiconductor nanowires; and 
 a contact layer covering the semiconductor nanowires and the protective layers provided on the first face, 
 
 the lens members are provided on the second face, 
 the contact layer is coupled onto the reflective plate, 
 the protective layers include a transition metal oxide, 
 lower ends of the protective layers are electrically coupled to the reflective plate, and 
 in the contact layer, the protective layers entirely cover vertical sides and lower portions of the respective semiconductor nanowires, the lower portions facing the reflective plate.